ImageBPP Property

The values returned by ImageBPP and their interpretation also depend on the ImageColorMode property.  Possible values are as follows:

1		1 bit-per-pixel grayscale (black and white) or indexed color.
2		2 bits-per-pixel grayscale or indexed color.
4		4 bits-per-pixel grayscale or indexed color.
8		8 bits-per-pixel grayscale or indexed color.
24		24 bits-per-pixel RGB color.
32		32 bits-per-pixel RGB color.